Reinforced Airfield Concrete Pavement Construction

62 Pages·2015·5.12 MB·English

by  Raiche, Colette

Reinforced Airfield Concrete
Pavement Construction
443 (Maritime Helicopter) Squadron Facility
Victoria, BC
Marla Hughesman, P.Eng., M.Sc., 1 Canadian Air Division, Department of National Defence
Dr. Upul Atukorala, Ph.D., P.Eng. and Ludomir Uzarowski, Ph.D., P.Eng., Golder Associates Ltd.
Peter Stecyk, A.Sc.T, Defence Construction Canada
William Tong, P.Eng., Stantec Consulting Ltd.
Acknowledgements
• QA Laboratory and Field Staff - Golder Associates Ltd. Victoria, BC
• Oon Soo Ooi, P.Eng. Golder Associates Ltd. Vancouver, BC
• QC Laboratory and Field Staff - Goal Engineering Ltd. Victoria, BC
• Consulting Metro Testing Burnaby, BC
• G. Lecuyer, P.Eng. EXL Engineering Inc, Victoria, BC
• Steve Heyer & Matt Haig, Knappett Projects Inc. Victoria, BC
• Tom Raagner (PM) & John Mah, P.Eng., Jack Cewe Ltd. Coquitlam, BC
• Manuel Garcia & Doug Kumm, Proform Concrete Services Inc. Red Deer, Alberta
• Paul L. Leuschen, Alliance Paving Solutions Inc. Underwood, Iowa 51576
• Todd Hanson & Doug Saqui, Butler Brothers Supplies Ltd. Central Saanich, BC
Acknowledgements
Presentation Outline
• Introduction
• Geotechnical Design
• Structural Design
• Concrete Pavement Design Requirements
• Construction Methodology
– Problems / Solutions
• Contractor’s QC Plan
• Construction QC/QA
• Contract Design Tolerances, Final Construction Tolerances
• Lessons Learned and Conclusions
Introduction
• Location of the new 443 (Maritime helicopter) Squadron is 30
kilometers North of Victoria BC at Victoria International Airport.
• The Squadron facility is a 20,000m2 operations, maintenance and
storage hanger in support of the Department of National Defence’s
Pacific Helicopter Fleet.
• To the East and North of the hangar is a 25,500m2 concrete apron
capable of accommodating five Sikorsky CH-148 Cyclone helicopters
and a Boeing CC-177 Globemaster.
• The apron area consists of two pavement thicknesses:
– 420mm on the North side of the facility to accommodate CC-177
– 300mm on the East side to taxi the CH-128 helicopters to the
hanger.
Geotechnical Design
Overall Site Grading:
• The original site grade was 3 m below the adjoining taxiway. Raising the
site grade would induce long-term settlements in the underlying clays.
• Measures were implemented to accelerate the settlements in the apron
area using preloading and surcharging of the subgrade
Apron Area:
• Sensitive to total and differential settlements. Apron to be constructed on
weak subgrade soils.
• Robust design of the concrete apron overlying Cement Treated Base (CTB).
Geotechnical Design
• Detailed field investigations were carried out to establish
subsurface conditions and variations in bedrock surface
elevations.
• Investigations were conducted in phases:
– Boreholes without rock coring/mapping at 9 locations.
– Cone Penetration Tests (CPT) at 3 locations.
– Seismic refraction (geophysical) surveys along 7 lines.
Geotechnical Design
Sample Soil Structure:
• A fill layer with thickness varying from 1 m to 2.5 m.
• Victoria Clay extending to a depth of 9 m to 10 m comprising 5 m of
crust (Su >100 kPa) and 4 m of firm clay (Su ~ 35 kPa).
• A thin layer of till-like soils (0.5 m to 1 m).
• Bedrock (UCS of 25 MPa).
• Generally flat ground surface.
Fill
Victoria Clay (Crust)
m
0
1
Victoria Clay (Firm)
Till
Bedrock
Geotechnical Design
Preloading/Surcharging:
• Areas where 3m of fill was placed, settled 70 to 90mm over a
period of 14 months.
• Predicted settlements were in the order of 125mm.
DND 443 (Maritime Helicopter) Hangar
Apron Slab Design